Burglar-alarm.



T. H. NELSON.

4 imRGLAB ALARM.

APPLICATION FILED JULY 15, 1912.

- Patented May 26, 1914;

STATES PATENT' OFFICE.

THEODORE 1H. NELSON,

of Illinois, have invented a certain new and useful Improvement in Burglar-Alarms, of

v which the following is a full, clear, concise, and cxactdescription,reference being had to the accompanying drawings, forming a part of this specification. I My invention relates to' burglar. alarms and contemplates the provisionyof an ex treinel'y simple. and eflicient device which nm )e securedto a window. oridoorand which will automatically close sin-electrical circuit if anyone should :open the-window or door with which it is associatedor tamperwith the device in any ways The various parts of the device mentionedate 180 0 1:

striictedand arranged that the-electrical contacts thereof are located near the;bot-

tom of the hollow casing forming part of the device, where they can 'notbe reached 'without closing the electrical circuit Another feature o f th e device referredto is the fact that if -the device tampered with even to'the extent of removing the,

screws by means of. which one ofthe two castings forming a cured, the electrical alarmcircuit-isclosed.

Other advantages of the burglar alarm=oi= my inventionwill appear as this descriptionprogresses.

My invention will be more clearly understood by reference to the accompanying drawings, in which- Figure 1 s a view showing the circuit closing device in side elevation, the window frame with which git is associated being shown in section; Fig. 2 is a view showing the circuit closing device ,in longitudinalsection; Fig. 3 is an end view of the device, part of the hollow casing or socket being Y roken away to reveal the contact devices within; Fig. 4 shows a modified form of circuit closing device embodying my invention;

Fig. 5 is a cross-sectional -view,thereo f taken on the line 5-5 of Fig. 4;. Fig. 6 is a longitudinal section ofa door and frame provided with a modified form of circuit closing device; Fig. 7 is a representation of an electrical circuit arrangement particularly adapted for use with thecircuit closing de-v vices before mentioned; and Figs. 8 and-9 show in front and side elevation respec- Specification of Letters .Patent.

partof the device is se-' or oiiioAGo, ILLINOIS.

, nuitenmamm.

Patented May 26,1914.

...,ip1ication iieaiui 15, 1 12;; Serial 1%.709352.

tively the plug carrying member of my circuitciosing device adjustably mounted upon the window sash with which it is associated.

Similar reference characters refer to simiw lar parts throughout the several views.

Referring to Figs. 1 to 3 inclusive, a window sash is shown at 8 and a window frame ati9, The window frame 9 is mortised as indicated at 10. Secured 'to the window frame and having a hollow portion extendng nto anopening 10 in the window frame s the hollow casing 11. This casing is provided with a flange 12 which is held rigidly a inst the window name by means of a p urahty of'screws 13, 13. The casingll is provided with a hollow head or socket 14 which is disposed at right angles to the re mainder of the casing. The end of the casing 11 within the opening '10 is closed by 7 means of suitable insulating material 14. Extending through the insulation 14 are the spring contacts 15 and'16 and a spring .17 provided with an up-turned portion 18. The contact springs 15 and 16 constitute part of an electrical alarm circuit.

Secured to the window sash by means of screws '19, '19 is the casting 20 provided with aplug 21. The plug 21 is provided at its lower end with suitable insulation 22. When the window is in 'its' closed position, the plug -21 extends down through the hollow head or r socket 14'of the casing 11 and separatesthemally in engagement with each other. When the plug 21. is in the position shown in the drawings, the spring 17 is depressed as plug 21 is also raised, whereupon spring contacts 15 and 16 engage each other and the electrical alarm circuit including said contacts is closed. it the screws 19, 19 should be removed the plug 21 is raised hyspring 17, allowing the spring contacts 15 and 16 to close'the alarm circuit. I

circuit closing device shown in Figs. 4 and. 5, contact spring 23' is.secured to the casing 25 and contact spring 24 is insulated therefrom by. suitable insulation 26. The congageinent with each other, are separated by means of. the plug 27 carried by the casting 28. .VVhen the plug 27 is in the position shown in Fig. 4, it depresses the spring 24 contact springs 15 and 16, which arenorshown. If the window sash 8 is raised the s In themodili'ed form of burglar alarm 100 tacts 23 and '24 which are normally in en- 106 out ofengagement with spring 23. The 110 springl7 ofthe device show-ninFi'gs. 1 t 3 54,; This bracket as provided with a. slot. inclusive, that is, it serves to raise-theplug- 56therein The-plu 'f zrrying casting 57 is v 27 if-the'serews securing'the casting. 28 to provided with. a 'T -s a'ped shank 58.' This spring, 24 performs the samefunc'tion as means: of a -pluralit fof screws 55 a bracket 5 the window sash are removed;

-In the form of circuit closing device shown; casting .57 .frdni being remove irony the in Fig. -6,th'e member28 carrying the' plug bracket 54 "when the .casting,is in the posi .A is secured to a door'or swinging'window tion'shown." The casting 57 may be secured as shown. The member25 within which fat any position relatively to the bracket 54 r are-located suitable eontaetfspringsvis se by means of a thumb screncISS cooperating 75 cured to the door. 6i"wii1dow fraine- When jvithiu nut 59i; Itcwill be seen that when this the door or window indicated at 29 is open,' arrangement is-used, the window sashmay the plug 27 is withdrawn fro n the 'Inen ber' opened a. trifle if desired and the lug carthereby allotirin gjthe, colitaetsprings rying member adjusted so that the a iarm de- 1 within the ine'mber 25 to close an electrical vices will not belactuated when the window 3 alarm circuit. 3 i sash is in said position, The alarm devices In-the circuit diagram shown in Fig. 7 'a- :will,'however, be actuated if the window be source of 'current'is, illustratedat 31,- 3 cu opeiiedany farther." 1 l 'cuit; closing devicat 32; a.-siwitch at'33,.a "J The arrangements shownin Figs. 1 to 5 gong at 34, and .a relay at35, Ii the.Wi'n-'" finclusive are applicable to-either the upper ow or door with which the-circuit closing or lower sashesofa window; The. bracket device 32 is associated is opened ortampcred and 'lugLshown' in F igs. Sand 9 are"pri-- with in such Juiaiiner asto fallow. the conmarii; intended'for use in connect-ion with tact s n'ings 39fand Z'ftOenga ge each other,- a. lower window'sashp '25 and t c -switch*33"i inthe position shown; While'I havehillustrated'my invention in a0 'ductor 4 1; switch blade'42, thr

current wi'll floii'as{ol1ows; fromthe-source: theyparticular 'einbodiments herein shown of current throughconductorg6circliilic o n ariddescribledQI'do not wish' to be-limitedto mg device 32, conductorigfiswitehblade 38;, thesegzconstructiong i'butdesire to felairn tonductor 39, the conductor 40, gong 34,' cqn-. broii'dly'any'equivalent constrictions which ough-con-f -may "s'ugg'est .themsl'vie'sj' to those skilled in ductor 43 back -to .th'efsouice f" urrenfl fih-mrvi A r This is the- 'simplejalarnrg' ci Iffithe .A What I cl springs of the circuit. iclo'sin' i; dev e should 1 be separated, the so nd-ihgofth 35 cease. j?

' If'the teh'f 3ilbep 42 is in electrical engage tor 44, a systelif i ,hiia '11} will to actuated-when th' of the circuit closing to gcr h e he sound even' if "thecontfi p arated' again; 'If't-h'e svtfit mgtheposi .tion referred to aIKi-blllbO tilti 4 and 32? are inigengaeemen tli'eaeh otlie v v i i nmqgf ph -j 55n6= 11j oil'set' portiom of thehollow I: rent through condeutor flfi ,cireuitjclosmgg memberitooperatesaidxontacts- I device 32, "conductor" 37-, siwitehfflbla'de 38, 2 A. circuit co'ntr :olli n;'deiiice-forfaiburg- -c r .l3 c d i oififis ri 'lar alarmsystein' comprising a tubular 'mem- 50 blade 42, .and c'on uetor 4 3. backto.thesource. berzadapted' to 'be carriedf by a window o u re t \V fi n'rentfiOWsthrough re- "frame and. project-therefrom horizontally lay 35 it will attract its arx'riature tfl' thereby jinto-et he anglebetweeiF-the' frame and a V releasing drop l8,li'rhei"eupon.currentlwill-s Qwin dow sashrmorable within the frame,,said fi o the Source n. 1: gh,c member-beingprovidedmt-its free end midtromjntothe angle between I'tliesash and the 55 ductor lf), drop 48, e0ndl'1 'ctor' 5 0;j g9 g' 4, -a hollow upturned portion; a 'secon'dnijemlw Conductor Switch 3 5 con lll rlmg 'b'er carried by the-window sash-"projecting back to the source of current; Itfi ill tlms- =therefrorn-and having a 'downtnrned" por 'be seen that after the dro pifll is'r elea'sdf -tion substimtially -in.alinement with the upcurrent will continue to; flowfthroughithe: turned portion of-thc first member, contacts:-

.00 gong 34 toactuate'tixisame even thonghthcin. said tubular: 1nembei',-:ind 'a pinearried current springs 32and 32fofthe eircmtclos-f by the- (lowntnrned portimrvof the second ing device are sepa ated. l member adapted to project into the up Rcferrin; te th: arrangement shown in ,tm-nod portion of the first member Cooper- Figs-S am 9, a portion of-a window sash is ate said.- contacts, said members when the ,5 shown at 53 to which there is secured by pin is disposed in the hollow member con- 'T sha ped shanlris adapted to revent the 7b rsashimmable 'thereim:

" frame, ieiich--ofsaid members' coniprisingan 1o5 iried thesechnd niembe'r adaptedto pro- 110 stitutinga continuous connection between the frame and the sash whichcan not be broken without actuating the alarm devices.

3. A circuit controlling device for a burglar alarm system comprising a first member adapted to be supported by a window frame and project therefrom into the angle between the frame and a sash movable within the frame, a second member adapted to be carried by the sash and project therefrom into the angle between the sash and frame, each of said members comprising two portions disposed substantially at right angles to each other, contacts within the first memher, and a pm carried by the second member adapted to project into the first member and operate said contacts, said members when said pin is disposed in the first member constituting a continuous connection between the frame and sash which can not be broken without actuating the alarm devices.

4. A circuit controlling device for a burglar alarm system comprising a first member adapted to be supported by a window frame and project therefrom into the angle between the frame and a sash movable within the frame, a second member adapted to be carried by the sash and project therefrom into the angle between the sash and frame, contacts within the first member, and a pin carried by the second member adapted to project into the first member and operate said contacts, said members when said pin is disposed in the first member constituting a continuous connection between the frame and sash which cannot be broken without actuating the alarm devices.

A burglar alarm system comprising a hollow member secured to a window frame, contacts within said hollow member adapted when operated, to establish a set condition of an alarm circuit, a bracket carried by the movable element of the window, said bracket comprising two spaced bars, a plug carrying member mounted on said bracket,

said plug carrying member comprising a substantially T-shaped tongue arranged to pass between said spaced bars, a bolt and nut arranged to retain said plug carrying member at any desired point on said bracket and a plu carried by said plug carrying member a apted to roject into said hollow member to operate 't e contacts therein.

6. A'burglar alarm system comprising a pair of contacts supported by a window,

frame, said contacts when operated adapted to establish a set condition of an alarm circuit, a contact operatin member adapted to be supported by a mova 1e element of the window, a supporting bracket arranged to be carried by the movable element of the window, and devices for securing said contact operating member at any one of a number of points on said bracket, whereby the burglar alarm system may be placed in set condition with the movable element of the window at any one of a number of open positions.

7. A burglar alarm'system comprising a air of contacts supported by a window rame, said contacts, when operated adapted V to establish a set condition of an alarm circuit, a contact operating member adapted to be supported by a movable element of the window, and devices for securing said contact operating member at any one of a number of positions relative to the movable element of the window, whereby the burglar alarm system may be placed in set condition with the movable element of the window at any one of a number of open positions.

In witness whereof, I hereunto subscribe my name this 8th day of July, A. D., 1912.

THEODORE H. NELSON.

Witnesses:

' ALBERTO. Benn,

ALBERT G. McCALEr Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0." 

